Mystery Hunters: The Bermuda Triangle and Other Danger Zones
Debating History: Debates on the 9/11 Attacks
Crime Scene Investigations: The John F. Kennedy Assassination: The Shooting That Shook America
Understanding the Paranormal: Investigating Bigfoot, the Loch Ness Monster, and Other Cryptids
World History: The Mysterious Maya Civilization
Disasters and Tragic Events: An Encyclopedia of Catastrophes in American History
Viewpoints on Modern World History: AIDS and Other Killer Viruses and Pandemics
Mysteries of History: Mystery of Area 51
Paranormal Investigations: Aliens, UFOs, and Unexplained Encounters
9/11 and the War on Terror: A Documentary and Reference Guide
Secret Societies and Clubs in American History
Making Headlines: The World's Most Shocking Secrets and Mysteries
Mysteries of History: Mystery of Atlantis
Mysteries of History: Mystery of the Nazca Lines
Paranormal Investigations: The Bermuda Triangle, Stonehenge, and Unexplained Places
End of Days: An Encyclopedia of the Apocalypse in World Religions
Mysteries of History: Mystery of the Roanoke Colonists